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Every problem in mathematics for the senior high school entrance examination. Thank you for your urgent need! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
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Suppose the price is x yuan. Single profit multiplied by sales quantity equals total profit. (X—40)[500— 10(X—50)]=8000。
Solve X=60 or X=80.
Then use 8000/(60-40) and 8000/(80-40) to find out two purchase conditions.